Drop Mac Python 3.9 builds?

[mrocklin]

Our OSX CI queue is often backed up, especially during US working hours. Our tests are not very sensitive to Python versions. I propose that we drop the 3.9 builds and keep 3.8 and 3.10.

Thoughts? cc @crusaderky @fjetter @graingert

[crusaderky]

Leaving everything else untouched, I don't think it's a wise idea. It's not just about python version.

• 3.8 is the only cythonized one
• 3.9 is the only one with CUDA
• 3.10 is the only one with several libraries at their git tip

We could move CUDA to 3.8 or 3.10 though.

[fjetter]

OSX is not a production OS but rather a developer OS and I would be perfectly fine to not test against all dependencies, cython, etc. Having the minimal set running would be OK for me. I can't remember hitting an OSX specific problem, so far.

[crusaderky]

OSX is not a production OS but rather a developer OS

It's production for the Client

[mrocklin]

I propose that we move CUDA to 3.8 and drop 3.9 Also, I don't know anyone who has an NVIDIA card on an OSX machine :)

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